Novel ventilation structure of dry-type transformer shell and transformer

Abstract

The invention relates to the technical field of power equipment, and discloses a novel ventilation structure of a dry-type transformer shell and a transformer, the structure comprises a shell provided with a middle partition plate, and a side air inlet and outlet air bellow. The air inlet air box and the air outlet air box are provided with outer filter screen covers, the ventilation window is provided with a rainproof shutter and a dustproof cotton assembly device, a self-cleaning device is installed in the center in the ventilation window, and through a motor rotating shaft eccentric block, centrifugal inertia force generated by rotation of the eccentric block is used as a vibration source to enable vibration to be transmitted to all dustproof cotton installation frames to achieve synchronous vibration self-cleaning. And dust is guided out by the dust guide plate. The middle partition plate, the coil and the iron core form a bottom-to-top directional air channel. Efficient heat dissipation of the transformer and automatic cleaning of the dustproof assembly are achieved, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to a dry-type transformer shell and a ventilation and heat dissipation structure thereof, and more particularly to a novel ventilation structure integrating an efficient directional air duct and an automatic dust-proof cotton cleaning function and a transformer comprising the structure. BACKGROUND

[0002] Dry-type transformers have been widely used in various indoor and outdoor environments. If the heat generated during operation cannot be dissipated in time, it will accelerate the aging of the insulation and affect the service life and reliability. For outdoor or dusty industrial environments, the contradiction between ventilation and protection is prominent: both ventilation and protection against dust and rainwater are required. The dust-proof mesh or dust-proof cotton installed on the ventilation port is easily clogged, resulting in a sharp decrease in heat dissipation efficiency, and the cost of manual cleaning and maintenance is high.

[0003] Existing technologies focus more on the optimization of heat dissipation inside the transformer body (such as improving the coil air duct, using heat pipes, etc.), for example, the published patent document CN118866514A focuses on balancing the temperature rise of the upper and lower coils, and the patent document CN119786196A optimizes the winding pouring and heat dissipation rib structure. However, these solutions do not systematically solve the problem of efficient heat dissipation, long-term protection, and maintenance-free self-cleaning from the overall ventilation system of the shell. Patent document CN118748118A relates to the cooling and vibration reduction of marine transformers, but it uses a complex internal and external circulation switching and double-layer vibration isolation, which is complex in structure and does not mention the dust-proof self-cleaning of the air inlet.

[0004] Therefore, there is an urgent need for an integrated shell ventilation solution that is compact in structure, can automatically maintain the unobstructed air inlet, and ensures efficient and orderly heat dissipation. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a novel ventilation structure for a dry-type transformer shell and a transformer. The structure aims to build a forced and orderly heat dissipation air duct and integrate an efficient and reliable dust-proof cotton self-cleaning function, thereby fundamentally reducing the maintenance requirements.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: In a first aspect, the present application provides a new ventilation structure of a dry-type transformer shell, comprising a transformer shell, an intermediate partition plate is arranged inside the transformer shell to separate the inner cavity into an upper partition layer and a lower partition layer; an air inlet air bellow is arranged on one side of the transformer shell, and an air outlet air bellow is arranged on the other side; a first side plate connected with the air inlet air bellow of the transformer shell is provided with an air inlet opening communicating the air inlet air bellow and the lower partition layer; a second side plate connected with the air outlet air bellow of the transformer shell is provided with an air outlet opening communicating the air outlet air bellow and the upper partition layer, and the air outlet opening is provided with an air extractor for extracting air in the upper partition layer into the air outlet air bellow; a dustproof cotton assembly and a self-cleaning device are arranged on the air inlet air bellow; the dustproof cotton assembly allows dust-removed air to enter the inside of the air inlet air bellow; the self-cleaning device drives the dustproof cotton assembly to vibrate to shake off dust on the dustproof cotton assembly to realize self-cleaning; a dust guide plate for receiving and guiding dust is arranged inside the air inlet air bellow below the dustproof cotton assembly.

[0007] Further, a square frame is arranged on the front of the air inlet air bellow; one detachable dustproof cotton assembly is arranged on each of the four partition positions of the square frame, and a self-cleaning device is arranged at the center position of the square frame; the self-cleaning device comprises a mounting bottom plate arranged at the center of the square frame, a driving motor arranged on the mounting bottom plate, and a vibration mechanism driven by the driving motor; the vibration mechanism periodically uses centrifugal inertia force generated by rotation of an eccentric block as a vibration source, and the vibration is transmitted to the square frame, so that the vibration is transmitted to the four dustproof cotton assemblies through the square frame. A square frame is arranged on the front of the air inlet air bellow. The square frame not only serves as a structural support, but also is a key vibration transmission medium. Since the square frame is a rigid whole, vibration at the center point is efficiently and synchronously transmitted to the four corner regions, so as to drive the four dustproof cotton assemblies arranged at the four corners to vibrate together. This one-hit-four-vibration design uses one power source to realize synchronous cleaning of all dustproof cottons, and the structure is extremely simple and efficient.

[0008] Further, the vibration mechanism comprises a protective cover, a rotating shaft arranged in the protective cover and driven by the driving motor, and at least one eccentric block fixedly arranged on the rotating shaft, and an opening is arranged on the side of the protective cover opposite to the square frame; the eccentric block periodically uses centrifugal inertia force generated by rotation of the eccentric block as a vibration source when rotating, and the vibration is transmitted to the square frame.

[0009] Further, an elastic gasket is arranged at the opening of the protective cover of the vibration mechanism or the knocking position of the eccentric block.

[0010] Furthermore, the dustproof cotton assembly includes an outer filter screen, filter cotton, and a grid-shaped support sheet stacked sequentially from the outside to the inside; the edge of the grid-shaped support sheet is in direct contact with the inner wall of the corresponding partition of the grid-shaped outer frame.

[0011] To optimize vibration transmission and enhance the durability of the dustproof cotton assembly, a multi-layered composite structure is employed. The edges of the grid-shaped support plates directly contact the grid-shaped outer frame, ensuring effective vibration energy input. Multiple connecting posts, passing through the filter cotton, are positioned between the grid-shaped support plates and the outer filter cover. These connecting posts not only provide additional support, preventing excessive deformation of the filter cotton under vibration and wind pressure, but more importantly, they form an additional vibration transmission path from the support plates to the filter cotton, ensuring effective vibration excitation in both the center and surrounding areas of the filter cotton, resulting in more thorough dust removal.

[0012] Furthermore, multiple connecting posts passing through the filter cotton are also connected between the grid-shaped support sheet and the outer filter screen cover.

[0013] Furthermore, the dustproof cotton assembly is installed on the grid-shaped outer frame at an angle inclined to the vertical plane.

[0014] Furthermore, the dust guide plate is an inclined plate with its high end located below the projection area of ​​all dustproof cotton components and its low end extending to the dust discharge port of the air inlet box.

[0015] Furthermore, the intermediate partition is provided with a through-hole for installing the transformer inside the transformer housing. The transformer includes a high-voltage coil, a low-voltage coil, and an iron core. A first ventilation gap is reserved between the intermediate partition and the high-voltage coil. A second ventilation duct is formed between the high-voltage coil and the low-voltage coil. A third ventilation gap is formed between the low-voltage coil and the iron core. The first ventilation gap, the second ventilation duct, and the third ventilation gap connect the lower partition and the upper partition, together forming an airflow channel from bottom to top.

[0016] Under the negative pressure created by the exhaust fan, external cold air enters the lower compartment from the air inlet box and is forced to flow sequentially through the three air ducts / gapes mentioned above. Only after sufficient heat exchange with all the main heat-generating components does it enter the upper compartment and be exhausted. This path design ensures no short-circuiting of the airflow and maximizes heat dissipation efficiency.

[0017] Furthermore, the front entrance of the air inlet box is also covered with a rain cover or rainproof louvers.

[0018] Furthermore, a rainproof ventilation opening is installed at the air outlet of the air outlet box.

[0019] Furthermore, the exhaust fan is connected to a temperature controller, which controls the start / stop or speed of the exhaust fan based on the temperature inside the transformer casing.

[0020] Secondly, the present invention proposes a dry-type transformer, including a transformer body and the aforementioned novel ventilation structure for the dry-type transformer casing, wherein the transformer body is installed inside the transformer casing of the ventilation structure.

[0021] The beneficial effects of this invention are as follows: Through the specific gap and air duct design between the intermediate partition, coil, and iron core, combined with a lateral forced exhaust fan, a forced air duct with low resistance, clear direction, and coverage of all heat sources is constructed, resulting in high and stable heat dissipation efficiency. The grid-shaped outer frame combined with the central excitation structure achieves simultaneous cleaning of four dustproof cotton components by a single power source in the simplest and most reliable mechanical way. The multi-layered composite dustproof cotton component design ensures vibration transmission efficiency and component lifespan. Combined with the dust guide plate, fully automatic dust cleaning and removal are achieved, fundamentally eliminating the need for manual cleaning. All functional modules are integrated on the side of the outer shell, without occupying additional space. The dustproof cotton components are detachable and modular; if replacement is required, only a single component needs to be removed without touching the entire cleaning mechanism, making maintenance convenient. The grid-shaped outer frame and dustproof cotton component structure are robust and have strong resistance to deformation, suitable for long-term vibration working environments. The modular design facilitates the addition of rain covers, rainproof louvers, etc., easily meeting high standard protection levels and adapting to harsh environments. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the dry-type transformer of the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram from another perspective; Figure 3 for Figure 1 A schematic diagram of the internal structure of a novel ventilation structure for the casing of a dry-type transformer; Figure 4 for Figure 2 A schematic diagram of the internal structure of a novel ventilation structure for the casing of a dry-type transformer; Figure 5 This is a schematic diagram of the internal structure of the air inlet box of the present invention; Figure 6 for Figure 3 Front view structural diagram; Figure 7 This is a schematic diagram of the eccentric block and rotating shaft of the present invention; Figure 8 This is a schematic diagram of the front structure of the air inlet box of the present invention; Figure 9 for Figure 8 A schematic diagram of the AA cross-sectional structure; Figure 10 for Figure 9 A magnified structural diagram at point B in the middle.

[0024] Figure label: 11. Air inlet box; 12. Grid-shaped outer frame; 13. Dustproof cotton assembly; 131. Outer filter cover; 132. Filter cotton; 133. Grid-shaped support plate; 134. Connecting column; 14. Dust guide plate; 15. Rainproof louvers; 21. Transformer casing; 22. First side plate; 23. Second side plate; 31. Air outlet box; 32. Rainproof ventilation opening; 33. Air outlet; 41. Air inlet; 51. Middle partition; 61. Transformer; 71. Exhaust fan; 8. Self-cleaning device; 81. Vibration mechanism; 811. Rotating shaft; 812. Eccentric block; 82. Mounting base plate; 101. First ventilation gap; 102. Low-voltage coil; 103. High-voltage coil; 104. Iron core; 111. Lower partition; 112. Upper partition. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] It should be noted that the directional terms such as "upper," "middle," "lower," "inner," and "outer" used below are defined based on the accompanying drawings in the instruction manual.

[0028] Example 1

[0029] like Figures 1-10 As shown, this invention provides a dry-type transformer, including a transformer body and a novel ventilation structure for the dry-type transformer casing. The novel ventilation structure for the dry-type transformer casing mainly comprises a transformer casing 21, an inlet air box 11, and an outlet air box 31. The transformer body is the transformer 61, which is installed inside the transformer casing 21 of the ventilation structure.

[0030] The transformer casing 21 is typically constructed from welded steel plates into a rectangular cabinet structure. Inside, a horizontal intermediate partition 51 is fixedly installed. This intermediate partition 51 clearly divides the interior of the transformer casing 21 into upper and lower parts: a lower partition 111 located below and an upper partition 112 located above. A through hole is provided in the center of the intermediate partition 51 for the transformer 61 to pass through.

[0031] The air inlet box 11 is fixedly connected to the first side plate 22 on one side of the transformer housing 21, specifically by welding or bolting. The lower part of the first side plate 22 has one or more rectangular air inlets 41, which directly connect the internal space of the air inlet box 11 to the lower partition 111 of the transformer housing 21.

[0032] The exhaust fan box 31 is fixedly connected to the second side plate 23 on the other side of the transformer housing 21. One or more air outlets 33 are provided in the upper middle part of the second side plate 23, and an exhaust fan 71, such as an axial flow fan, is installed at each air outlet 33. When the exhaust fan 71 is running, it draws air from the partition 112 on the transformer housing 21 into the exhaust fan box 31. The exhaust fan box 31 has a final exhaust port on its front or side and is equipped with a rainproof ventilation opening 32 to prevent rainwater backflow.

[0033] One of the core innovations of this invention lies in the dustproof and self-cleaning module of the air inlet box 11. For example... Figure 5 , Figure 8 and Figure 9 As shown, a grid-shaped outer frame 12, constructed of welded metal profiles (such as angle steel or square tubing), is fixedly installed at the front opening of the air inlet box 11. This grid-shaped outer frame 12 has a robust structure and evenly divides the entire front opening into four rectangular ventilation zones with approximately equal areas.

[0034] Within each ventilation zone, a removable dustproof cotton component 13 is installed. The installation method can be either clip-on or screw-fixed. A self-cleaning device 8 is installed at the geometric center of the grid-shaped outer frame 12.

[0035] like Figure 5 As shown, the self-cleaning device 8 mainly includes a mounting base plate 82, a drive motor, and a vibration mechanism 81. The mounting base plate 82 is fixed to the center of the back of the grid-shaped outer frame 12 by bolts. The drive motor (e.g., a 24V DC geared motor) is fixed to the mounting base plate 82. The vibration mechanism 81 includes a metal protective cover 813, which is fixed to the mounting base plate 82 and is completely open on the side facing the grid-shaped outer frame 12. A rotating shaft 811 driven by the drive motor 83 is provided inside the protective cover 813. At least one eccentric block 812 is fixedly mounted on the rotating shaft 811. Alternatively, the drive motor can also be located inside the protective cover 813.

[0036] like Figure 7 As shown, there can be one or more eccentric blocks 812. When the drive motor drives the rotating shaft 811 to rotate, the eccentric blocks 812 rotate at high speed. Due to the mass eccentricity, during rotation, the eccentric blocks 812 will periodically impact the corresponding central area on the back of the grid-shaped outer frame 12. To protect the grid-shaped outer frame 12 and reduce vibration noise, a layer of elastic pads made of rubber or silicone can be attached to the opening edge of the protective cover 813, or directly to the contact area between the eccentric blocks 812 and the grid-shaped outer frame 12.

[0037] The dustproof cotton assembly 13 adopts a multi-layer composite structure design to achieve efficient vibration transmission and reliable support. For example... Figure 10 As shown, the dustproof cotton assembly 13 includes, from the outside (windward side) to the inside (inside the air inlet box), an outer filter screen 131, a filter cotton 132, and a grid-shaped support plate 133.

[0038] The outer filter screen 131 is usually made of perforated metal sheet, which serves as primary protection and supports the frame.

[0039] Filter cotton 132 is the main filter medium, such as non-woven fabric or synthetic fiber filter media, which is cut into rectangles to match the partitions.

[0040] The grid-shaped support plate 133 is a key vibration receiving and transmission component. It can be a metal stamping or injection molding part, and its grid-shaped rib structure provides strong rigid support. During installation, the grid-shaped support plate 133 is located on the innermost side, and its outer edge is in direct and close contact with the inner edge of the corresponding section on the grid-shaped outer frame 12, thereby ensuring that the vibration energy transmitted from the grid-shaped outer frame 12 can be efficiently input into the support plate 133.

[0041] To further enhance vibration transmission and prevent the filter cotton 132 from collapsing or deforming in the middle under long-term wind pressure and vibration, multiple connecting posts 134 are provided between the grid-shaped support plate 133 and the outer filter screen 131. These connecting posts 134 can be metal screws or plastic posts, which pass through pre-set holes in the filter cotton 132 and are fixedly connected at both ends to the grid-shaped support plate 133 and the outer filter screen 131 respectively (e.g., threaded connection or heat fusion connection). In this way, the connecting posts 134 not only fasten the three-layer structure into a whole component, but more importantly, they form an additional path for transmitting vibration directly from the inner grid-shaped support plate 133 to the middle area of ​​the filter cotton 132 and the outer filter screen 131, so that the entire plane of the filter cotton 132 can be effectively vibrated, resulting in more uniform and thorough dust removal.

[0042] At the bottom inner part of the air inlet box 11, directly below all the dustproof cotton assemblies 13, a dust guide plate 14 is installed at an angle. This dust guide plate 14 is typically a metal plate, with its upper end fixed by a bracket and its lower end extending to a dust discharge port (which may be equipped with a movable door) opened in the side wall of the air inlet box 11. The angle of the dust guide plate 14 should be designed to ensure that dust can slide off automatically, for example, between 30° and 45°.

[0043] like Figure 3 and Figure 4 As shown, transformer 61 is installed inside transformer casing 21, and includes an iron core 104, a low-voltage coil 102 wound on the iron core 104, and a high-voltage coil 103. An intermediate partition 51 is fitted around the high-voltage coil 103, maintaining a certain distance between them to form a first ventilation gap 101 surrounding the high-voltage coil 103. Multiple vertical second ventilation channels are formed between the high-voltage coil 103 and the low-voltage coil 102 through spacers such as insulating pads. A third ventilation gap is also provided between the low-voltage coil 102 and the iron core 104. These three gaps / channels (first ventilation gap 101, second ventilation channels, and third ventilation gap) form a parallel, bottom-up heat dissipation channel between the lower partition 111 and the upper partition 112.

[0044] To adapt to outdoor environments, a rainproof louver 15 that slopes downwards and outwards can be added to the front of the air inlet box 11 and the outside of the grid-shaped outer frame 12. The exhaust port of the air outlet box 31 is already equipped with a rainproof ventilation port 32.

[0045] Brief description of working principle: Heat dissipation process: When the transformer is running, the exhaust fan 71 starts, creating a negative pressure in the upper partition 112 and the outlet air box 31. Under the pressure difference, external cold air first passes through the rainproof louvers, then through the filtration of four dustproof cotton components 13, and the clean air enters the inlet air box 11 and smoothly enters the lower partition 111 through the bottom air inlet 41. Under the strong suction of the exhaust fan 71, the cold air is forced to flow upward. It has no choice but to be diverted and pass through three parallel paths in sequence: 1) through the third ventilation gap between the low-voltage coil 102 and the iron core 104; 2) through the second ventilation duct between the high-voltage coil 103 and the low-voltage coil 102; 3) through the first ventilation gap 101 between the high-voltage coil 103 and the intermediate partition 51. As the air flows through these channels that tightly surround the heating coil, it undergoes sufficient heat exchange, and the temperature rises. Ultimately, all the heated air gathers in the upper partition 112, is drawn into the exhaust box 31 through the exhaust port 33 by the exhaust fan 71, and is finally discharged through the rainproof vent 32. This path is forced, orderly, and free of short circuits, resulting in extremely high heat dissipation efficiency.

[0046] Self-cleaning process: When the control system (e.g., based on running time or based on differential pressure sensor signals installed on both sides of the dustproof cotton) issues a cleaning command, the drive motor of the self-cleaning device 8 starts. The motor drives the rotating shaft 811 and the eccentric block 812 to rotate at high speed. The eccentric block 812 periodically and forcefully strikes the back of the center of the grid-shaped outer frame 12. Since the grid-shaped outer frame 12 is a rigid whole, the intense vibration wave is transmitted from the center to the four corner areas almost instantaneously. The grid-shaped support plates 133 of the four dustproof cotton components 13 rigidly connected to the corners then generate strong synchronous vibrations. The vibration energy acts directly on the back (inner surface) of the filter cotton 132 through the ribs of the support plates 133, and is also transmitted to the middle and outer filter screen 131 of the filter cotton 132 through multiple connecting columns 134. This causes the entire fiber web of the filter cotton 132 to be shaken, and the dust firmly attached to its surface separates and falls off from the fibers due to inertial force. The loose dust falls downwards under gravity and is caught securely by the inclined dust guide plate 14 below. It then slides down the slope to the ash discharge port at the lower end and is finally discharged outside the transformer. After the cleaning process is completed, the motor stops, the dustproof cotton regains its high breathability, and the ventilation and heat dissipation system continues to operate efficiently.

[0047] Example 2

[0048] Based on Example 1, this example has been further optimized, mainly involving the installation angle of the dustproof cotton component and the details of the vibration mechanism.

[0049] In this embodiment, the dustproof cotton assembly 13 is not installed perpendicular to the ground, but is tilted inward (i.e., towards the inside of the air inlet box 11) at an angle α. This tilt angle α can range from 5° to 25°, for example, 15°. The advantages of this design are very obvious: First, during the self-cleaning vibration process, the tilted surface is more conducive to dust sliding down the surface of the filter cotton under the action of its own gravity tangential component, avoiding dust accumulation in the lower half of the filter cotton; second, from an aerodynamic point of view, the slightly tilted windward surface may have a certain positive effect on guiding airflow into the bottom of the air box.

[0050] In addition, a U-shaped rubber strip can be inlaid around the opening edge of the protective cover 813 of the vibration mechanism 81. This rubber strip can act as a buffer to reduce the direct hard impact of the eccentric block 812 on the grid-shaped outer frame 12, thus protecting the structure and reducing noise. At the same time, it can also limit the outward spread of vibration to a certain extent, so that the energy is transmitted more concentratedly through the grid-shaped outer frame 12.

[0051] Example 3

[0052] This embodiment illustrates another specific construction and installation method of the dustproof cotton component 13, as well as the expansion of the control system.

[0053] In the dustproof cotton assembly 13, the grid-shaped support plate 133 can be die-cast from lightweight, high-strength aluminum alloy. Radial reinforcing ribs can be added inside the grid pattern of the grid-shaped support plate 133 to further enhance its rigidity and optimize vibration transmission performance. The filter cotton 132 can be encapsulated within a thin plastic frame to form a standard filter module. The edge of this plastic frame has hooks, while the corresponding mounting edge of the outer filter screen 131 has a slot, allowing for quick and easy connection. The connecting post 134 can be designed as a threaded metal rod at both ends. One end screws into the grid-shaped support plate 133, and the other end passes through the filter cotton 132 and is locked to the outer filter screen 131 with a nut. This design makes replacing the filter cotton 132 much faster; simply loosen the nut at one end of the connecting post 134 to remove the old filter module and replace it with a new one.

[0054] In terms of control, the exhaust fan 71 can be connected to a thermostat. The temperature probe of the thermostat is located in the hot air collection area of ​​the upper partition 112. The thermostat can be set with multiple temperature thresholds, for example: when the temperature is below 40℃, the exhaust fan 71 is stopped or operates at its lowest speed (energy-saving mode); when the temperature is between 40℃ and 70℃, the exhaust fan 71 operates at a medium speed; when the temperature is above 70℃, the exhaust fan 71 operates at full speed to dissipate heat with maximum airflow. Simultaneously, the drive motor 83 of the self-cleaning device 8 can be a variable frequency motor and is linked to a differential pressure sensor. The differential pressure sensor monitors the air pressure difference across the dustproof cotton assembly 13. When the differential pressure reaches a preset value (indicating that dust blockage has reached a certain level), the control system not only initiates the cleaning program but also adjusts the speed of the variable frequency motor according to the magnitude of the differential pressure, thereby adjusting the vibration intensity. The greater the differential pressure, the higher the vibration intensity can be set in the initial cleaning stage to achieve more thorough dust removal, reflecting an intelligent cleaning strategy.

[0055] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A novel ventilation structure for a dry-type transformer casing, comprising a transformer casing, characterized in that, The transformer casing has an internal partition that divides its interior cavity into an upper partition and a lower partition. An air inlet box is located on one side of the transformer casing, and an air outlet box is located on the other side. A first side plate connecting the transformer casing to the air inlet box has an air inlet that connects the air inlet box and the lower partition. A second side plate connecting the transformer casing to the air outlet box has an air outlet that connects the air outlet box and the upper partition, and this air outlet is equipped with a fan that draws air from the upper partition into the air outlet box. The air inlet box is equipped with a dustproof cotton assembly and a self-cleaning device; the dustproof cotton assembly allows filtered air to enter the interior of the air inlet box. The self-cleaning device drives the dustproof cotton assembly to vibrate and shake off the dust on the dustproof cotton assembly to achieve self-cleaning; inside the air inlet box, below the dustproof cotton assembly, there is a dust guide plate for receiving and guiding the dust out.

2. The novel ventilation structure for a dry-type transformer casing according to claim 1, characterized in that, The front of the air inlet box is provided with a grid-shaped outer frame; a detachable dustproof cotton component is installed at each of the four partition positions on the grid-shaped outer frame, and a self-cleaning device is installed at the center of the grid-shaped outer frame; the self-cleaning device includes a mounting base plate installed at the center of the grid-shaped outer frame, a drive motor installed on the mounting base plate, and a vibration mechanism driven by the drive motor; the vibration mechanism periodically uses the centrifugal inertial force generated by the rotation of the eccentric block as the vibration source, and the vibration is transmitted to the grid-shaped outer frame, so that the vibration is transmitted to the four dustproof cotton components through the grid-shaped outer frame.

3. A novel ventilation structure for the casing of a dry-type transformer according to claim 2, characterized in that, The vibration mechanism includes a protective cover, a rotating shaft located inside the protective cover and driven by a drive motor, and at least one eccentric block fixedly mounted on the rotating shaft. The protective cover has an opening on the side facing the grid-shaped outer frame. When the eccentric block rotates, it periodically uses the centrifugal inertial force generated by the rotation of the eccentric block as a vibration source, and the vibration is transmitted to the grid-shaped outer frame.

4. A novel ventilation structure for the casing of a dry-type transformer according to claim 3, characterized in that, Elastic pads are provided at the opening of the protective cover of the vibration mechanism or at the striking part of the eccentric block.

5. A novel ventilation structure for the casing of a dry-type transformer according to claim 2, characterized in that, The dustproof cotton assembly includes an outer filter screen, filter cotton, and a grid-shaped support sheet stacked sequentially from the outside to the inside; the edge of the grid-shaped support sheet is in direct contact with the inner wall of the corresponding section of the grid-shaped outer frame.

6. A novel ventilation structure for the casing of a dry-type transformer according to claim 5, characterized in that, The grid-shaped support plate and the outer filter screen are also connected by multiple connecting posts that pass through the filter cotton.

7. A novel ventilation structure for the casing of a dry-type transformer according to claim 2, characterized in that, The dustproof cotton assembly is installed on the grid-shaped outer frame at an angle inclined to the vertical plane.

8. A novel ventilation structure for the casing of a dry-type transformer according to claim 1, characterized in that, The dust guide plate is an inclined plate with its high end located below the projection area of ​​all dustproof cotton components and its low end extending to the dust discharge port on the wall of the air inlet box.

9. A novel ventilation structure for the casing of a dry-type transformer according to claim 1, characterized in that, The intermediate partition plate is provided with a through-hole for installing the transformer inside the transformer housing. The transformer includes a high-voltage coil, a low-voltage coil, and an iron core. A first ventilation gap is reserved between the intermediate partition plate and the high-voltage coil. A second ventilation duct is formed between the high-voltage coil and the low-voltage coil. A third ventilation gap is formed between the low-voltage coil and the iron core. The first ventilation gap, the second ventilation duct, and the third ventilation gap connect the lower partition and the upper partition, together forming an airflow channel from bottom to top.

10. A dry-type transformer, characterized in that, The invention includes a transformer body and a novel ventilation structure for the dry-type transformer housing as described in any one of claims 1 to 9, wherein the transformer body is installed inside the transformer housing of the ventilation structure.

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